Nature Erases Pulses of Human CO2 Emissions

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Those committed to blaming humans for rising atmospheric CO2 sometimes admit that emitted CO2 (from any source) only stays in the air about 5 years (20% removed each year) being absorbed into natural sinks.  But they then save their belief by theorizing those human emissions are “pulses” of additional CO2 which persist even when particular molecules are removed, resulting in higher CO2 concentrations.  The analogy would be a traffic jam on the freeway which persists long after the blockage in removed.

A recent study by Bud Bromley puts the fork in this theory.  His paper is A conservative calculation of specific impulse for CO2.  The title links to his text which goes through the math in detail.  Excerpts are in italics here with my bolds.

In the 2 years following the June 15, 1991, eruption of the Pinatubo volcano, the natural environment removed more CO2 than the entire increase in CO2 concentration due to all sources, human and natural, during the entire measured daily record of the Global Monitoring Laboratory of NOAA/Scripps Oceanographic Institute (MLO) May 17, 1974, to June 15, 1991.

Then, in the 2 years after that, that CO2 was replaced plus an additional increment of CO2.

The Pinatubo Phase I Study (Bromley & Tamarkin, 2022) calculated the mass of net CO2 removed from the atmosphere based on measurements taken by MLO and from those measurements then calculated the first- and second-time derivatives (i.e., slope and acceleration) of CO2 concentration. We then demonstrated a novel use of the Specific Impulse calculation, a standard physical calculation used daily in life and death decisions. There are no theories, estimates or computer models involved in these calculations.

The following calculation is a more conservative demonstration which makes it obvious that human CO2 is not increasing global CO2 concentration.

The average slope of the CO2 concentration in the pre-Pinatubo period in MLO data was 1.463 ppm/year based on the method described in Bromley and Tamarkin (2022). Slope is the rate of change of the CO2 concentration. The rate of change and slope of a CO2 concentration with respect to time elapsed are identical to the commonly known terms velocity and speed.

June 15, 1991 was the start of the major Pinatubo volcanic eruption and April 22, 1993 was the date of maximum deceleration in net global average atmospheric CO2 concentration after Pinatubo in the daily measurement record of MLO.

The impulse calculation tells us whether a car has enough braking force to stop before hitting the wall, or enough force to take the rocket into orbit before it runs out of fuel, or, as in the analogy in the Phase Pinatubo report (Bromley & Tamarkin, 2022), enough force to accelerate the loaded 747 to liftoff velocity before reaching the end of the runway, or enough force to overcome addition of human CO2 to air.

MLO began reporting daily CO2 data on May 17, 1974. On that day, MLO reported 333.38 ppmOn June 15, 1991, MLO reported 358 ppm. 358 minus 333 = 25 ppm increase in CO2. This increase includes all CO2 in the atmosphere from all sources, human and natural. There is no residual human fraction.

25 ppm * 7.76 GtCO2 per ppm = 194 GtCO2 increase in CO2

For this comparison, attribute to humans that entire increase in MLO CO2 since the daily record began. This amount was measured by MLO and we know this amount exceeds the actual human CO2 component.

11.35 GtCO2 per year divided by 365 days per year = 0.031 Gt “human” CO2 added per day. Assume that human emissions did not slow following Pinatubo, even though total CO2 was decelerating precipitously.

Hypothetically, on April 22, 1993, 677 days later, final velocity v of “human” CO2 was the same 0.031 per day. But to be more conservative, let v = 0.041 GtCO2 per day, that is, “human” CO2 is growing faster even though total CO2 is declining sharply.

Jh = 2.17 Newton seconds is the specific impulse for our hypothetical “human” CO2 emissions.


♦  2.17 Newton seconds for hypothetical “human” CO2 emissions
♦  -55.5 Newton seconds for natural CO2 removal from atmosphere

In this conservative calculation, based entirely on measurements (not theory, not models, and not estimates), Earth’s environment demonstrated the capacity to absorb more than 25 times the not-to-exceed amount of human CO2 emissions at that time.

The data and graphs produced by MLO also show a reduction in slope of CO2 concentration following the June 1991 eruption of Pinatubo, and also shows the more rapid recovery of total CO2 concentration that began about 2 years after the 1991 eruption. This graph is the annual rate of change of total atmosphere CO2 concentration. This graph is not human CO2.

During the global cooling event in the 2 years following the Pinatubo eruption, CO2 concentration decelerated rapidly. Following that 2-year period, in the next 2 years CO2 accelerated more rapidly than it had declined, reaching an average CO2 slope which exceeded MLO-measured slope for the period prior to the June 1991 Pinatubo eruption. The maximum force of the environment to both absorb and emit CO2 could be much larger than the 25 times human emission and could occur much faster.

We do not know the maximum force or specific impulse. But it is very safe to infer from this result that human CO2 emissions are not an environmental crisis.

Theoretical discussion and conclusion

These are the experiment results. Theory must explain these results, not the other way around.

Bromley and Tamarkin (2022) suggested a theory how this very large amount of CO2 could be absorbed so rapidly into the environment, mostly ocean surface. This experimental result is consistent with Henry’s Law, the Law of Mass Action and Le Chatelier’s principle. In a forthcoming addendum to Bromley and Tamarkin (2022), two additional laws, Fick’s Law and Graham’s Law are suggested additions to our theory explaining this experimental result.

There are several inorganic chemical sources in the sea surface thin layer which produce CO2 through a series of linked reactions. Based on theories asserted more than 60 years ago, inorganic and organic chemical sources and sinks are believed to be too small and/or too slow to explain the slope of net global average CO2 concentration. Our results strongly suggest that the net CO2 absorption and net emission events that followed the Pinatubo eruption are response and recovery to a perturbation to the natural trend. There is no suggestion in our results or in our theory that long-term warming of SST causes the slope of net global average CO2 concentration. We have not looked at temperatures or correlation statistics between temperature and CO2 concentration because they are co-dependent variables, and the simultaneity bias cannot be removed with acceptable certainty. References to 25 degrees C in Bromley and Tamarkin (2022) are only in theoretical discussion and not involved in any way in our data analysis or calculations. References to 25 degrees C are merely standard ambient temperature, part of SATP, agreed by standards organizations.

When CO2 slope and acceleration declined post-Pinatubo, why was there a recovery to previous slope, plus and additional offset? The decline and the recovery were certainly not due to humans or the biosphere. As we have shown, CO2 from humans and biosphere combined are over an order of magnitude less than the CO2 absorbed by the environment and then re-emitted. That alone should end fears of CO2-caused climate crisis. Where did the CO2 go so rapidly and where did the CO2 in the recovery come from? Our data suggests that in future research we will find a series of other events, other volcanoes, El Ninos and La Ninas, etc. that have similarly disrupted the equilibrium followed by a response and recovery from the environment.


Tom Segalstad produced this graph on the speed of ocean-CO2 fluxes:

Background:  CO2 Fluxes, Sources and Sinks

via Science Matters

June 16, 2022

Nature Erases Pulses of Human CO2 Emissions | Science Matters (

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